D70 Battery Life per Charge

On Wed, 21 Jul 2004 08:27:40 GMT, "David J Taylor"
wrote:

Roger Halstead wrote:
[]
Lithium batteries discharge all by themselves even when sitting on the
shelf. It's some % per day, but I don't remember the figure.
[]
Roger Halstead (K8RI & ARRL life member)

Lithium Ion?

Yes, Li_ion :-))


Li-Ion have a much smaller self-discharge than NiMH - almost so small you

That they do.

can ignore it over a month. NiMH can be as high as 30% per month.

You can ignore it for a month, but the capacity is diminished which
you will notice if you go out and shoot a lot of pictures. There is
a self discharge rate listed for both LI-Ion and NiMH although I seem
to have misplaced it... I'll eventually find it. I do believe it was
discussed on this group a year or two back.

I've found NiMH to apparently be higher than 30% a month. For my
radios (5W HTs) I have found a NiMH battery to be almost useless after
just setting on the shelf for a month. The same is true for the AAs I
use in the OLY E-20N. They will only be good for a few shots, while a
fresh charged set is good for about 200-300 shots.

I don't have enough experience with the Nikon battery to say what it
is after a month, but it's in good shape. It has such good capacity
that for normal shooting I don't worry about it. Yes, I ignore the
self discharge in that case, but if I'm going to do a lot of shooting,
or it's been a month, I top the battery off.

Either the D-70 uses very little current, or the 1400 MAh battery
really has a lot more real capacity than the 2200 MAh AAs I use in the
E-20N, or both. Then again, I notice the same kind of difference
between my Kenwood THG-7A (MiMH) and Yaesu VX-7R (Li-Ion)
In both cases the capacity of the LIthium Ion batteries is well less
than the NiMH, but they tend to last longer.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

73,
David

Roger Halstead wrote:

You can ignore it for a month, but the capacity is diminished which
you will notice if you go out and shoot a lot of pictures. There is

You'd have to measure awfully carefully to notice it, I suspect.

When you do your testing, make sure you let the batteries sit for
a month OUTSIDE of the camera, not inside, since the camera may be
drawing some charge even when turned off. I'd that for the D70 this
is more significant than the LiIon's self-discharge.

Unless you put the LiIon through temperature variations, then I bet
you'll get some self-discharge loss.


--
There are two types of tasks in life: those which become less urgent
as time passes, and those which become more urgent. Rotating one's
..signature file is a task of the latter type.

Roger Halstead wrote:

You can ignore it for a month, but the capacity is diminished which
you will notice if you go out and shoot a lot of pictures. There is

You'd have to measure awfully carefully to notice it, I suspect.

When you do your testing, make sure you let the batteries sit for
a month OUTSIDE of the camera, not inside, since the camera may be
drawing some charge even when turned off. I'd that for the D70 this
is more significant than the LiIon's self-discharge.

Unless you put the LiIon through temperature variations, then I bet
you'll get some self-discharge loss.


--
There are two types of tasks in life: those which become less urgent
as time passes, and those which become more urgent. Rotating one's
..signature file is a task of the latter type.

"David J Taylor"
wrote in message ...
Roger Halstead wrote:
[]
Lithium batteries discharge all by themselves even when sitting on the
shelf. It's some % per day, but I don't remember the figure.
[]
Roger Halstead (K8RI & ARRL life member)

Lithium Ion?

Li-Ion have a much smaller self-discharge than NiMH - almost so small you
can ignore it over a month. NiMH can be as high as 30% per month.

73,
David
------------------
The link here suggests that there is some self-discharge with Li-Ion
batteries ... but not much.

http://www.batteryuniversity.com/parttwo-34.htm

Don F

"David J Taylor"
wrote in message ...
Roger Halstead wrote:
[]
Lithium batteries discharge all by themselves even when sitting on the
shelf. It's some % per day, but I don't remember the figure.
[]
Roger Halstead (K8RI & ARRL life member)

Lithium Ion?

Li-Ion have a much smaller self-discharge than NiMH - almost so small you
can ignore it over a month. NiMH can be as high as 30% per month.

73,
David
------------------
The link here suggests that there is some self-discharge with Li-Ion
batteries ... but not much.

http://www.batteryuniversity.com/parttwo-34.htm

Don F